<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>
  <body>
    <div>ksksksk</div>
    <script src="./index.js"></script>
  </body>
  <script>
    let name = "Nicholas";
    let age = 36;
  </script>
  <script>
{
  a = 1
  function a() {}
  a = 2
  console.log(a) // 输出1
}
console.log(a) // 输出2

  </script>
</html>
